Home > Courses > 1P21_Sternin > RotationalMotion Centripetal force $F_c = ma_c = {{mV^2}\over r}=m\omega^2 r, \qquad \vec{F_c}\> \|\> \vec{a_c}\> \bot\> \vec{V}$ $F_c$ can be provided by: model airplane: $F_c=T$, tension in the wire satellite in orbit: $F_c=G{{mM_E}\over{R^2}}$, Earth's gravity car turning: $F_c=f_s$, static friction (between the tire and the road)